On Feb 1, 2007, at 10:48 AM, Hans J. Prueller wrote:
david,
thank you for your comments.
please note: our problem is that we have to migrate a project
consisting of about 70 CMP/CMR’ed entity beans (ejb2.1).
it will be impossible for us to migrate the whole app at once from
ejb2.1 to openJPA or something else. so what my plan
is, is to continue running the application within our current
ejb2.1 container and perform a step-by-step migration of the
ejb2.1 entity beans from ejb2.1 to openJPA – still running within
our ejb2.1 container.
as soon as all “old” entity beans are migrated to openJPA we then
could easily switch the whole app to Geronimo.
Sorry, I forgot you are trying to run your app in a _different_
ejb2.1 container :-)
You should still be able to specify the mapping in a mapping.xml.
However I suspect if you can convince the other app server to run
under jdk 1.5 openjpa will be able to deal with annotations just as
it does in geronimo.
I think the major problem you are likely to run into is that unless
there's container managed persitence contexts your transaction
behavior is going to be difficult to control.
thanks
david jencks
Hans
Von: David Jencks [mailto:[EMAIL PROTECTED]
Gesendet: Donnerstag, 01. Februar 2007 18:29
An: [email protected]
Betreff: Re: using OpenJPA in EJB2.1 application (was: ejb2.1 to
Geronimo2.0 migration strategy)
On Feb 1, 2007, at 7:41 AM, Hans J. Prueller wrote:
Hi together,
I decided that it would be a valuable way to migrate existing
CMP2.1 EJBs to OpenJPA, as this should also work
OUTSIDE a Java EE 5 (and therefore inside EJB2.1) container. The
problem I see is that I have to provide the OpenJPA
mappings as Java5 annotations, and EJB2.1 projects are bound to
Java 1.4 – without having annotations.
run geronimo under jdk 1.5. This will work unless you are using
corba. The almost released 1.2 might work if you are using corba.
Is there a way of providing the mapping via XML-descriptor too?
yes, as per jpa spec.
Does anybody see other possible failures when running OpenJPA
within a Java EE 1.4 container?
I'm not sure why you don't want to use annotations. You should use
the geronimo 1.2 not-quite-released version which includes jpa and
in particular openjpa support. I converted the daytrader
performance test app to use jpa and it works fine. In particular
you can use container managed entity managers/persistence contexts
rather than app managed ones. You might like to take a look at
daytrader trunk, it has all the annotations and a jpa plan. You do
need to run geronimo under jdk 1.5 for this to work.
svn co https://svn.apache.org/repos/asf/geronimo/daytrader/trunk
daytrader
thanks
david jencks
regards,
Hans
===========================
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